Summary
You can create a seed list of email addresses in your account. All campaign sends of 2000 or more will automatically also get sent to this seed list (not triggered campaigns, transactional email, etc.). It's a good idea to employ a seed list as it will enable anyone on it to monitor sending activity from your account.
Please note:
Steps to create a seed list
Similarly, if you want to remove an email address from the seed list, delete it from the box and then click Update.